Patent GB-1003800-A (GB)
Title: Method of and apparatus for doffing yarns in the centrifugal pot spinning process
IPC: D01H1/08
Filed: 1963-10-09
Abstract: 1,003,800. Doffing-apparatus. ASAHI KASEI KOGYA KABUSHIKI KAISHA. Oct. 9,1963 [Oct. 11, 1962], No. 39853/63. Heading D1D. Yarns are doffed in pot-spinning by moving the yarns laterally towards a lead-not or winding- up device, removing the cakes, ejecting fluid towards the pots along the normal yarn paths, and severing the yarns so that the yarns so severed are guided into the pots by the ejected fluid. In Fig. 1, each yarn passes from a spinneret around a godet 1 and then around a godet 2 and into the pot 4. Beneath the upper godets is arranged a pipe 5 carrying nozzles 10, guide-members 11 and a guide-member 6 which, by a rope 7 can be made to travel along a slot in the pipe. The member 6 Fig. 15 comprises a yarn-gripper 8 and a cutter 9 each of which can be turned between inoperative and operative positions, determined by stops 82, 92. The nozzles each comprise a slot 103 between inclined plates 104, and each member 11 comprises a yarn-guide 112 aligned between the members 8 and 9. Each nozzle is connected by a flexible pipe 21 to a source of pressure-fluid 20 via a valve 19, spring-urged to closed position and which can be opened as a roller on the valve-stem is lifted when a cam 18 is moved in a slot in a tube 16 by a rope 17. The cam 18 is pivoted at one end so that it can be swung into inoperative position in the slot. The normal position of the tube 5 is one in which a pin 13 engages a stop 14<SP>1</SP> so that the nozzles are in the dotted line positions out of the way of the yarn. For doffing, the tube 5 is moved to a position where pin 13 engages a stop 14 to bring the nozzles into full line position, the yarns being guided by the plates 104 to run along the slots 103. The gripper 8 and cutter 9 are moved to operative and inoperative positions respectively, and the rope 7 is operated to move the member 6 to the right, the gripper successively engaging the yarns and taking them into the path of a reciprocating guide 15 which lays them in slots in a rotating spool 12 on which they are wound. The pots are stopped and the cakes removed. With the gripper 8 and knife 9 both in inoperative position, the member 6 is returned to starting point on the left, when it begins to move again to the right; the knife having been moved to operative position, the yarns are severed below the nozzles. Rope 17 having been operated to cause the cams 18 to open the valves fluid is ejected through the nozzles to carry the yarns into the pots for spinning to re-start. In Fig.19, the yarns extending to the pots from godets 203 are moved to the right by a combined guide and cutter 261 fixed to a chain 212 and guided by pulleys on a rail 211. The yarns are thus successively bent around guides 622, and as the part 261 continues its travel, the yarns are severed below the guides and carried to rollers 207 to pass to a waste-receptacle or be wound-up. A valve is opened to deliver pressure-fluid to nozzles 291, and a cutter 208 (not shown) fastened to the chain 212 behind the member 261 severs the yarns above the guides so that spinning can re-start. Tripmembers move the members 261 and 208 into and out of operative position and the pipe 292 to which the nozzles 291 are attached is moved to the right after doffing so that the nozzles do not interfere with the ballooning yarn. In modifications, the cutter 208 and guide 261 may be carried by separate chains so that they can be moved at different speeds, and the cutter 208 may be replaced by a number, one at each spinning position, operatively interconnected.